Doctrinal preaching is not, nor should it ever be, simply the collection and distribution of biblical information. What one knows and thinks about God greatly impacts his worldview. Doctrine influences understanding, attitude, choice, and action. If doctrine is anything, it is practical. It is emotive. Doctrine impacts life. Sound theology is important for the people of God. They need it.
You’re a Theologian Too!
In my first philosophy class, Dr. Wiley Richards said something to the effect of, “Everyone is a philosopher. Everyone thinks. Thus everyone is a philosopher.” Some believe theology to be an academic study better left to the seminary or trained pastor. Theology, at it’s simplest, revolves around our thoughts about God. Therefore, you’re a theologian too!